00:02
Hi there.
00:03
In this question, we are concerned with a set of four quantum numbers.
00:07
We want to identify that set that could represent a certain electron.
00:12
So before we get to the electron that we're trying to represent, let's talk about the four quantum numbers.
00:17
The first quantum number is the principal quantum number, and it's given the letter n.
00:22
The principal quantum number is the energy level.
00:29
And it can be any positive integer.
00:36
The energy level closest to the nucleus is any quantifference.
00:39
Equals 1, but then as you move farther out from the nucleus, and increases, but only in integer increments.
00:49
All right, the next quantum number, l, the angular momentum quantum number, describes the sub -level.
01:00
And l ranges from values of 0 to and minus 1.
01:10
And these are also integer values.
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So l has to be an integer.
01:16
And it ranges from 0 to n minus 1.
01:19
So if n were 3, l could be 0, 1, or 2.
01:23
And it tells us the specific sub -level.
01:26
So when l equals 0, we have an s -orbital.
01:30
When l equals 1, that describes p -orbital.
01:33
When l equals 2, the orbitals.
01:36
And when l equals 3, those would be f -orbital.
01:40
All right, the next quantum number is the magnetic quantum number, m -sub -l, and it describes the orientation of the orbital in space.
01:51
M sub -l also has to be an integer, and it ranges from negative l to positive l...